Differential data managing apparatus

Abstract

A differential data managing apparatus includes: a comparison display section which displays data items in each of databases in a tree structure, and displays the data items that are different with each other between the databases as differential data items distinguishably from the other data items; Portable Document Format (PDF) generation section which generates detailed PDF files from detailed data in each of the databases, the detailed data related to the data items being selected from the differential data items; and a differential PDF generation section which acquires the generated detailed PDF files, and generates a differential PDF file in which a difference between the generated detailed PDF files are converted into image information.

1 . A differential data managing apparatus, comprising:
 a comparison display section which displays data items in each of databases in a tree structure, and displays the data items that are different with each other between the databases as differential data items distinguishably from the other data items;   a portable document format (PDF) generation section which generates detailed PDF files from detailed data in each of the databases, the detailed data related to the data items being selected from the differential data items; and   a differential PDF generation section which acquires the generated detailed PDF files, and generates a differential PDF file in which a difference between the generated detailed PDF files are converted into image information.   
   
   
       2 . The differential data managing apparatus according to  claim 1 , wherein the differential PDF generation section outputs the generated differential PDF file to at least one of a display, a printing section and a file output section. 
   
   
       3 . The differential data managing apparatus according to  claim 1 ,
 wherein one of the databases is an engineering database storing engineered data to be downloaded to an application database, and   the other is a master database that reflects contents of the application database.   
   
   
       4 . A system, comprising:
 the differential data managing apparatus according to  claim 3 ; and   a controller which controls devices in a plant and has the application database.   
   
   
       5 . A system, comprising:
 the differential data managing apparatus according to  claim 3 ; and   a safety controller which has the application apparatus, and acquires trip information from a device in a plant and executes shutdown operation of the plant.   
   
   
       6 . The differential data managing apparatus according to  claim 1 , wherein the databases include any two databases among a plurality of databases whose backups are created for version management.